Oh, @Occupywaii has already been suspended. (We all reported it last night.)
Do NOT assume twitter will always kill such accounts. They have a very spotty record. You have to nail them before they accrue followers. Once they have, they will only kill them if they clearly try to impersonate (rather than parody or attack), and you can prove it, which can be hard.
I'd still consider the name change for OccupyWallSt account, as it will lock in awareness of the #ows tag fast. Posting it prominently on the ows.org site, as Justine and I once discussed, will also have dramatic impact.
I'm around all day, if anyone needs me, working on a new kind of project that should help people understand all the projects :)